Honestly the difference between 1/4000 and 1/8000 is literally nothing.
I know that this difference is nothing. But i type it to say "6D is not a higher level body, it has new type sensor advantages." You know for canon if the number is small, body is better 5<6
I think there are a lot of people here who would argue that the 7D is a superior camera to the 6D. I'm not one of them. I just think they're different. But 6 is less than 7 so by your argument 6D is better.
In any given release cycle, your argument has some
validity, but you cannot compare a 5D to a 6D or a 7D. And you cannot compare a 5D2 to either of them either. You are grasping at straws. And of course, the 70D looks to be a big improvement over the 60D, but that's a different numbering system.
You complain about the sync speed. Why not get a 7D? It's sync speed is 1/250th. So is that of the 60D. Or better yet, get a leaf shutter camera that can sync at any speed. Or, just use high speed sync if you really want 1/200th.
Back to the 7D, it also has more FPS and superior AF than the 5D2, and you can use the Sigma 10-20 that you already have. Sure the sensor is smaller, but the body is at least arguably superior. And it's still being manufactured. They were on eBay now from Adorama refurbished by Canon for $849 but they've raised the price to $949 for the last one. They sold a lot of them at $849.
Worried about 1/4000 vs 1/8000? Get a ND filter for each of your lenses. Or get a 7D.
You have been advised by many experienced and knowledgeable photographers here that you are making a mistake in seeking a "new" 5D2. A used one would be a different story, as they can be a bargain. You insist that you know better by picking at small details out of context from the whole picture. We call this "missing the forest for the trees" in English.
My assessment is that you are either a child or a troll. I know you'll say that you are neither, but there really is no other explanation.
BTW, if you really want a 5D2 you can get a Canon USA refurbished model with a full one year USA warranty for $1,759.20 at http://shop.usa.canon.com/shop/en/catalog/cameras/refurbished-eos-digital-slr-cameras/eos-5d-mark-ii-body-refurbished
My experience with Canon refurbished products is that they are like new, and generally have been thoroughly checked for any problems, and brought to factory specs. Their quality control is perhaps better than on new gear. They come in a white box, but that is really the only difference.